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The scientific objectives of the Apollo 11 mission, in order of priority, were the following: [list=1][*]To collect early in the extravehicular activity (EVA) a sample, called the contingency sample, of approximately 1 kg of lunar surface material to insure that some lunar material would be returned to Earth. [*]To fill rapidly one of the two sample return containers with approximately 10 kg of the lunar material, called the bulk sample, to insure the return of an adequate amount of material to meet the needs of the principal investigators. [*]To deploy three experiments on the lunar surface: [*]A passive seismometer to study lunar seismic events, the Passive Seismic Experiment Package (PSEP) [*]An optical corner reflector to study lunar librations, the Laser Ranging Retroreflector (LRRR) [*]A solar-wind composition (SWC) experiment to measure the types and energies of the solar wind on the lunar surface[/list] [*]To fill the second sample return container with carefully selected lunar material placed into the local geologic context, to drive two core tubes into the surface, and to return the tubes with the stratigraphically organized material, called the documented sample.
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